114 lines
1.7 KiB
Go
114 lines
1.7 KiB
Go
package main
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import (
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"fmt"
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"math/rand"
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)
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type Suit int
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func (s Suit) String() string {
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switch s {
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case 0:
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return "♠"
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case 1:
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return "♥"
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case 2:
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return "♦"
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case 3:
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return "♣"
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case 4:
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return "★"
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default:
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panic("bad suit")
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}
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}
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type Card int
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func (c Card) Joker() bool {
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return (c == 0)
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}
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func (c Card) Masked() bool {
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return (c == -1)
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}
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func (c Card) Suit() Suit {
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if c.Joker() || c.Masked() {
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panic("Suit on invalid")
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}
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return Suit(int(c) % 5)
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}
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func (c Card) Face() int {
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if c.Joker() || c.Masked() {
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panic("Face on invalid")
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}
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return int(c) / 5
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}
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func (c Card) String() string {
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if c.Joker() {
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return "Jok" // 🂿 U+1F0BF
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}
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if c.Masked() {
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return "INV" // Invalid
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}
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switch c.Face() {
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case 11:
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return fmt.Sprintf(" J%s", c.Suit().String())
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case 12:
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return fmt.Sprintf(" Q%s", c.Suit().String())
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case 13:
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return fmt.Sprintf(" K%s", c.Suit().String())
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default:
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return fmt.Sprintf("%2d%s", c.Face(), c.Suit().String())
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}
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}
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func NewMasked() Card {
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return Card(-1)
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}
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func NewJoker() Card {
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return Card(0)
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}
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func NewCardFrom(face int, suit Suit) Card {
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return Card(face*5 + int(suit))
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}
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func Shuffle(c []Card, entropy *rand.Rand) {
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entropy.Shuffle(len(c), func(i, j int) {
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c[i], c[j] = c[j], c[i]
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})
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}
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const DeckSize = 58 * 2
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func Deck() []Card {
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// The full game deck is two 58-card decks
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// Each 58-card deck has 3 jokers plus {3..10 J Q K} in 5 suits.
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ret := make([]Card, 0, DeckSize)
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for i := 0; i < 6; i++ {
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ret = append(ret, NewJoker()) // Joker
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}
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for s := 0; s < 5; s++ {
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for f := 3; f < 14; f++ {
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ret = append(ret, NewCardFrom(f, Suit(s)), NewCardFrom(f, Suit(s)))
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}
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}
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return ret
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}
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